I'm not a mechanical engineer, but I tend to take the opinion that the resonator is there for a reason. From what I've been told, the resonator actually helps with the exhaust scavenging effect, so removing it could actually negatively affect performance. That being said, I'm a bit skeptical of that personally, but I felt I had to play devil's advocate. If you're just looking for a little bit more flow, I'd go with the 04+ exhaust mainfolds. They are pretty close to logs even stock. At least, the ones I found on a comp-g are.
